DOC dependencies: RH systems, ES not required

Author: larsmans

doc/setup.rst

@@ -5,12 +5,16 @@ Setting up xtas
 Installation
 ------------
 
-Make sure you have `Elasticsearch <http://www.elasticsearch.org/>`_ and
-`RabbitMQ <http://www.rabbitmq.com/>`_ running. Installation instructions for
-those can be found in various places. Make sure you have Python 2.7 or newer.
-Some tasks require a Java VM. xtas is primarily developed on Linux; OS X
+Make sure you have `RabbitMQ <http://www.rabbitmq.com/>`_ running.
+Installation instructions for RabbitMQ can be found in various places;
+using your operating system's package manager is usually the easiest option
+(e.g., ``apt-get install rabbitmq-server``).
+Make sure you have Python 2.7 or newer.
+Some tasks also require a Java VM. xtas is primarily developed on Linux; OS X
 support is not regularly tested, but issues/patches are welcome. Windows is
 not supported.
+xtas can talk to `Elasticsearch <http://www.elasticsearch.org/>`_ and use if
+for document storage, but ES is not a hard dependency.
 
 TL;DR: ``pip install xtas``.
 
@@ -22,6 +26,13 @@ manager, in which case it's a good idea to install other dependencies too
     sudo apt-get install rabbitmq-server python-scipy openjdk-7-jre \
         python-virtualenv build-essential python-pip libxslt-dev
 
+For CentOS/Fedora/Red Hat-style systems (this list is incomplete)::
+
+    sudo yum install atlas-dev java-1.7.0-openjdk lapack-dev libxslt-devel \
+        numpy python-devel rabbitmq-server scipy
+
+(RabbitMQ is an `EPEL <https://fedoraproject.org/wiki/EPEL>`_ package.)
+
 For other systems, including Macs, getting SciPy through a Python distro
 such as `Anaconda <http://continuum.io/downloads>`_ saves you the trouble
 of setting up C, C++ and Fortran compilers.